/*
 * This file is part of Applied Energistics 2. Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved. Applied
 * Energistics 2 is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General
 * Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
 * later version. Applied Energistics 2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
 * Public License for more details. You should have received a copy of the GNU Lesser General Public License along with
 * Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.util.item;

import java.util.Iterator;
import java.util.NoSuchElementException;

import appeng.api.storage.data.IAEItemStack;

public class MeaningfulItemIterator<T extends IAEItemStack> implements Iterator<T> {

    private final Iterator<T> parent;
    private T next;

    public MeaningfulItemIterator(final Iterator<T> iterator) {
        this.parent = iterator;
    }

    @Override
    public boolean hasNext() {
        while (this.parent.hasNext()) {
            this.next = this.parent.next();

            if (this.next.isMeaningful()) {
                return true;
            } else {
                this.parent.remove(); // self cleaning :3
            }
        }

        this.next = null;
        return false;
    }

    @Override
    public T next() {
        if (this.next == null) {
            throw new NoSuchElementException();
        }

        return this.next;
    }

    @Override
    public void remove() {
        this.parent.remove();
    }
}
